66992976 has 60 divisors (see below), whose sum is σ = 190085428. Its totient is φ = 22021632.

The previous prime is 66992969. The next prime is 66992983. The reversal of 66992976 is 67929966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66992969) and next prime (66992983).

It can be written as a sum of positive squares in 2 ways, for example, as 47279376 + 19713600 = 6876^2 + 4440^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7326 + ... + 13698.

Almost surely, 2^66992976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66992976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95042714).

66992976 is an abundant number, since it is smaller than the sum of its proper divisors (123092452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66992976 is a wasteful number, since it uses less digits than its factorization.

66992976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460 (or 6451 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 66992976 is about 8184.9237015381. The cubic root of 66992976 is about 406.1406163576.

The spelling of 66992976 in words is "sixty-six million, nine hundred ninety-two thousand, nine hundred seventy-six".